Molding-machine.



. PATENTED MAY 19, 1908:

- A. T. DRYSDALE.

MOLDING MACHINE,

APPLIQATION FILED NOV.15. 1906.

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withcaoco "UNITED STATES PA'rE.n 'r. 01am.

ALEXANDER T. DRYSDALE, F LOUISVILLE, KENTUCKYL MOLDING-MACHINE.

Specification of Letters Patent.

Patented May-19. 1908.

Application filedNovember 15, 1906. Serial No. 3%,571.

T 0 all whom it may concern:

Be it known that I. ALEXANDER T. 'D'RYsimproved machine with the partsin initial in the parts in successive positions. 20 I pggition; Figs. 2,3 and 4, similar views showi n the drawings indicates a pedestal which,at its upper end, supports a hollow casing 11, the upper end 12 of whichforms s 'tialy uniform cross section.

' ling-valve 23.

the follow board having a central opening adapted to fit the pattern 13,which pattern rovided with a portion 13 of substan- Pattern 13 iscarried at the upper end of a plungerlvertically reciprocable within acylinder 15 formed in the upper end of )edestal 10. Leading intocylinder 15 is a eed pipe 16 having a suitable three-way controllingvalve 16 At an intermediate point'pedestal 10 is provided with anenlargement forming a piston head 17 which fits the interior of a cylinder 18, thus forming, within said cylinder, an upper chamber 19 and alower chamber 20, the lower end of the cylinder fitting snugly upon thelower cylindricalend of the pedestel 10, as shown. Sleeved upon theupper end of pedestal 10 is a hollow plunger 21 which extends down intochamber 19 of cylinder 18, the upper end of'the cylinder 18 fitting theexterior of said hollow plunger snugly. Leading into chamber is a supplypipe 22 having a suitable controlling valve 22 and leading into thechamber 19 is a suitable supply ipe 23 having a control- T 'e'f hollowplunger 21 carries a stobl 25 at its upper end, said stool being adaptedto support a supplemental flask 26. The supplemental flask 26 receivesthe main flask 27 and the upper endof main flask 27 receives a second.supplemental flask 28, the depth of the supplemental flasks bemg suchesto provide for proper compression of the sand, as described later.Pivotallyconnected to the cylinder- 18 by suitable bars 30 is apressurehead 31 which carries a compression plate 32,adaptedto enter the upperend of the supplemental flask 2 8, I

The operatlon is as follows: With the parts in the positions shown inFig. 1, the several flasks have been filled with sand and there is afluid pressure within the lower end of cylinder 15 and within chamber19, said pres-- sures being sufficient to hold the attern 13 in itsinitial position and the. stoo 25 in its initial position. Fluidpressureis then introduced into chamber 20, said fluid pressure being in excessof the fluid pressure in chamber 19. Thereupon the cylinder 18 is moveddownwardly over iston 17 tothe position shown in Fig. 2, t e compressionplate 32 passing down through the supplemental flask 28 until it comeslevel with the to of the main flask 27 At the same time -t 1e cross head31 comes into en agement with the top of supplemental flas 2 Furtherfluid pressure within-chamber 2 causes the flasks to move downwardlyrelative "to'the follow board, which remains stationary, and, the.attern being supported by a fluid pressure ess than the fluid pressureexerted in cham-- ber 20, the pattern also yields downwardly and movesdown through the follow board until the arts are brought to thepositions shown in *ig. 3, where the follow board lies even with thelower end of the main flask 27, the sand being thus "compressedimmediately adjacent the pattern. lhereupon the fluid pressure iswithdrawn fromc *linder 15 and the pattern sinks to the position shownin Fig. 4. Thereupon fluid pressure is Withdrawn from chamber 20 andintroduced. into chamber 19, thus driving cylinder 18 and thehollo'w-plun er 21 u ward toheir initia positions, so that flas 27 withthe con letcd mold therein may be withdrawn, a ne flask introduced, theseveral flasks filled with sand, and the operation repeated. i

It will be readily understood that other means maybe used to effect thenecessary movements of the compression plate, the flasks and thepattern, without departing from my invention.

I claim as my invention:

1. In a molding machine, the combinetion, with a'stationaiy followboard, of a pattern support and pattern movable relative thereto wherebythere is a stripping action between the follow board and pattern, aflask support also movable relative to the follow board, and a comressor plate arranged to coact with the 0 relative thereto.

2. 'In-a molding machine, a pedestal, said pedestal having a cylinder in1ts upper end and a piston head intermediate its ei ht, a cylindersleeved upon- "said piston means for introducing fluid pressure intosaid cylinderlupon each side of the piston head,

OW board and movable means for introducing fluid pressure into the -tonhead intermediate its eight, a cylinder sleeved upon said piston head,means 'for introducin fluid pressure into said cylinder upon eac side 0'ead,

ollow board, flask support, patthe piston head, means for a introducingfluid pressure into the pedestalcylinder, a plun er mounted in saidpedestalcylinder, a tubu ar plunger sleeved ucpon the pedestal andprojecting into one en of the cylinder sleeved over the piston head, apattern carried by the plunger, a follow board carried by the edestal, aflask support carried b the ho OW plunger, and a compres- 4 sion p atecarried by the movable cylinder,

the said movable cylinder carrying means for I engaging flasks carriedby the flask support all of said arts being combined and arrangedsubstantia ly as and for the purpose set forth. 4

Inwitness whereof, I, have hereunto set my hand and seal at Louisville,Kentucky, this ninth day of November, A. D. one -thousand nine hundredand six.

ALE ANDER T. DRYSDALE. [his] Witnesses:

. AUSTIN B. KINNAIRD,

ROBERT CLARK MARSHALL.

